The schedule and the pressure of trying to do Doctor Who on any budget - including Avatar's - is horrific. I am never, ever going to say I've got enough money - that's like asking, "Would you like to be more happy?"

Doctor Who is incredibly well looked after by the BBC - they are incredibly aware of its crown jewel status, that it's not merely a show that's successful now.
Doctor Who often features expensive premises and set.

I truly believe it could be a show that outlives everybody in this room. It could carry on that long, so it doesn't just make money now - it'll make money forever.

Of course I'd like more money, just as I'd like to be happier, thinner and more handsome!

On the ongoing debate about whether or not there'd be a big-screen version of Doctor Who:

I'm sure that we should do a movie. The one thing that I always keep saying is it can't ever be allowed to interfere in any way with the television show - that is the mother-ship. The absolute most important thing about Doctor Who will always be the TV show - it would be great to see the TARDIS on the big screen, but not in the way of the show.

Finally, the old chestnut of a female lead for the show also came up:

It is a part of Time Lord lore that it can happen - a Time Lord could potentially turn into a woman. The more often it's talked about, the more likely it is to happen someday, I suppose.